body {
  font-family: 'Segoe UI', sans-serif;
  background: linear-gradient(135deg, #e0eafc, #cfdef3);
  margin: 0;
  padding: 40px 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
}
h1 {
  font-size: 28px;
  font-weight: bold;
  margin-bottom: 20px;
  color: #343a40;
}
.tabs {
  display: flex;
  justify-content: center;
  margin-bottom: 30px;
}
.tab {
  padding: 15px 30px;
  cursor: pointer;
  background-color: #007bff;
  color: white;
  font-weight: 600;
  border-radius: 10px;
  margin: 0 5px;
}
.tab.active {
  background-color: #343a40;
}
.container {
  background: white;
  padding: 30px;
  border-radius: 16px;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
  width: 100%;
  max-width: 600px;
  margin-bottom: 40px;
}
h2 {
  text-align: center;
  margin-bottom: 25px;
  color: #333;
}
label {
  font-weight: 600;
  margin-top: 15px;
  display: block;
}
input, select {
  width: 100%;
  padding: 12px;
  margin-top: 6px;
  border: 1px solid #ccc;
  border-radius: 8px;
}
button {
  margin-top: 20px;
  width: 100%;
  background-color: #007bff;
  color: white;
  padding: 14px;
  font-size: 16px;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 600;
}
canvas {
  margin-top: 20px;
  max-width: 300px;
  max-height: 300px;
  margin-left: auto;
  margin-right: auto;
  display: block;
}
.calculator {
  display: none;
}
.calculator.active {
  display: block;
}
.text-results {
  margin-top: 15px;
  font-size: 16px;
  color: #333;
  text-align: center;
}